Desorption flow fault detecting device and method for vehicle evaporative emission system and vehicle

Abstract

The invention discloses a desorption flow fault detecting device and method for a vehicle evaporative emission system and a vehicle. The device comprises an ECU, a pressure sensor, a flow restrictionorifice, a switching valve, a first vacuum pipeline, a second vacuum pipeline and a third vacuum pipeline. The diameter of the flow restriction orifice is smaller than an inner diameter of the secondvacuum pipeline, one end of the first vacuum pipeline is in communication with the atmosphere, the other end of the first vacuum pipeline is connected to a first end of the switching valve, the flow restriction orifice is disposed on the first vacuum pipeline, one end of the second vacuum pipeline is in communication with the atmosphere, the other end of the second vacuum pipeline is connected toa second end of the switching valve, one end of the third vacuum pipeline is connected to a third end of the switching valve, and the other end of the third vacuum pipeline communicates with an atmospheric communication port of an activated carbon canister of the vehicle or is connected to an air inlet of a desorption control valve of the vehicle, and the pressure sensor is set on the third vacuumpipeline. According to the device, the accuracy of detecting a desorption flow fault of the vehicle evaporative emission system is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of vehicle emission, and in particular to a vehicle evaporative emission system desorption flow fault detection device, method and vehicle. Background technique [0002] Currently, vehicles powered by internal combustion engines are still the mainstream of the automotive market. Vehicles powered by internal combustion engines are usually supplied with fuel by a fuel tank system. According to the current requirements of my country's light-duty vehicle emission regulations, the fuel tank system needs to include an evaporative emission system to recover the fuel vapor in the fuel tank system and prevent the fuel vapor from being discharged into the atmosphere to pollute the environment. A typical evaporative emission system includes an activated carbon canister for absorbing fuel vapor generated in the fuel tank, and a desorption control valve in the middle of the pipeline connecting ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a vehicle evaporative emission system desorption flow fault detection device, method and vehicle to solve the technical problem of low accuracy of the current evaporative emission system desorption flow fault detection method

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